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Science · 2026 · 2 marks
CBSE 2026 · Region 1 · Set 2 · Q25
How is tooth decay related to pH ? How can it be prevented?
Marking-scheme solution
Tooth decay starts when pH of mouth is lower than 5.5.
It can be prevented by cleaning the mouth after eating. / By using toothpastes as they are basic in nature.
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CBSE Class 10 Science past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.